In a general live performance sense, this is fairly common, for obvious reasons. Just a few of the things that can invoke it:

You're the singer, and you've just forgot your lines or you've came in at the wrong place or you've fallen to Vocal Range Exceeded. Or, alternately, you're one of the other members of the band and you notice the singer is in trouble. Similar for guitarists making major errors (or having lied about their skill level beforehand), and really a problem if the drummer or rhythm guitarist is the person having issues keeping the beat - that often induces a small version of Mass "Oh, Crap!" with all the other band members realizing just how bad the song's going to sound and how bad the gig is likely going to be.

Someone has gotten sick or injured onstage or in the audience. This one easily turns into Mass "Oh, Crap!" as well, for obvious reasons.

One of the band members' sound output is failing somehow. Worst is if it's one of the guitars (including the bassist), or the keyboardist, because that carries the possibility that the instrument itself failed (though it's usually only a loose connection) - and while most venues do carry extra mics for a singer to use in a pinch (or can patch him/her directly into the PA system with a lapel mic or a smartphone if set up for it and all else fails, though this is often avoided because it will make the singer much louder than the band), most don't have a stray electric guitar or bass or keys lying around, and even if the person has a backup, the show has to stop to set up his/her gear again for the new instrument.

Gakupo's reaction in Madness of Duke Venomania when he realizes just who the "girl" in his arms really is, just before being stabinated by Karchess, who dressed himself up as a woman to save Yufina, one of the Duke's harem, and take revenge on him.

When German pop act Milli Vanilli performed live on MTV in 1989, everything was going well until their hit song "Girl You Know It's True" started skipping during the chorus (unfortunately, there don't seem to be any videos on Youtube that aren't either dubbed over or butchered), revealing that it was prerecorded and that Milli Vanilli were lip-syncing all along. The two continued dancing and "singing" along before That Syncing Feeling set in and they realized that the gig was up. This was the beginning of the end for the band.

In "Dinosaurchestra Part 3" by Lemon Demon, the time machine which the narrator used to go back to the late Cretaceous period and start a rock band with dinosaurs can't make the return trip, and then..."What's that rock way up in the sky?"

In the Gorillaz video for "Stylo", when 2-D and Murdoc realize that they are being chased and shot at by none other than Bruce Willis.

In the beginning of "Welcome to the Jungle," a singer briefly and subtly says "Oh my...god" before any of the intro gets through.

In the song "Get My Gun" by D12, Eminem angrily threatens a fan with a gun:

Wassup, bitch?! (cocks gun) Autograph this! (click) ...Oh, shit.

Speaking of Eminem, the title character of "Stan" is recording the latest letter he's sending to his hero on an audio tape while his pregnant girlfriend is locked in the boot of his car and he's about to drive them all off a bridge to their deaths. He has a massive Oh, Crap! when he realises just before the car goes over the edge that he's overlooked one fairly important point...

Well gotta go, I'm almost at the bridge now/Oh shit! I forgot! How am I supposed to send this shit out-

Followed by Eminem getting one himself as he responds to Stan's previous letter, telling him that he needs to calm down before he does something crazy, like this one psycho on the news who locked his girlfriend in the trunk of his car and drove off a bridge:

And in the car they found a tape, but they never said who it was to/Come to think about it, his name was... it was you... damn...

In "Der Erlkönig", the boy is increasingly terrified (and justly so) each time he tries to get it through to his father that the Erlking is after him [the boy].

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